The new version of the steam vr handle button binding does not know whether it is an official oversight or it was originally set like this. It is indeed a pit.
Solution: After binding and packaging during the development process, you will find that you can only use the official custom uses. After the new version, you need to bind on steamvr itself after packaging. Right-click steamvr and click on the device. Manage the control handle and select your own project. Just set up a custom button. Running the project is OK